Thanks, all.
Eatbrie:
You guessed one of them. I first saw "Suspiria" in high school and loved it- the atmosphere, music, cinematography, and story (well, what there was of a story). I have that Italian fotobusta set. Definitely a fan of Italian horror and thrillers of the 60s and early 70s. I like Bava's gothic horror entries. But also the Lenzi- and Martino-style gialli of the early 70s, like "Paranoia" (w/ Carroll Baker) and "The Strange Vice of Mrs. Wardh" (with a silent "h," apparently...). These thrillers were highly produced (cinemascope with high production values), yet experimental and innovative, full of exotic locations, and captured the zeitgeist of the time.
So I guess I lean towards Euro-horror. I was first introduced to Hammer from their "Phantom of the Opera" entry.
My favorite Hammer film is probably "Nightmare" (1964), because it scared the crap out of my when I was in 6th grade (I got the VHS as part of MCA Home Video's "Hammer Horror Collection"). Very underrated psychological thriller. Great script, and direction by the renowned Freddie Francis. Recommended for the many who have not seen it. It's on YouTube, and perfect for a humid, summer night. I have tons of posters/stills from this film.